Communication is a very important technology in the Internet of Things architecture. Through communication, the data captured by the underlying sensors can be transmitted to the upper-level cloud system. Chu Jiazheng, manager of information and wireless communication services in East Asia, pointed out that the application of the Internet of Things is diverse. Different environments and targets have different requirements for communication technology. Regardless of the type of standard, it is recommended that the entire system be operated more stably.
At present, the communication of the Internet of Things depends on the distance and has different standards. The short distance includes Zigbee, Bluetooth, RFID, NFC, Ant+, LoWPAN, etc. The medium distance is Wi-Fi, WAVE, the frequency band and transmission rate of these technical standards. The communication protocols are not the same. Chu Jiazheng puts emphasis on the certification of important technologies for each frequency band in the "AIoT Generation Network Signal Detection Aspects".
He pointed out that Bluetooth is currently the mainstream technology of short-range wireless communication. In the past, it was mainly used in mobile phones. Later, it was promoted by the technology alliance SIG. At present, it has been widely used in smart phones, homes, automobiles, medical fields, etc. Bluetooth is also actively entering the Internet of Things. The low-power features of Bluetooth Smart and Bluetooth low energy (BLE), which were developed in the past, are suitable for sensors in the IoT architecture. The SIG released the Bluetooth 5.0 version in 2016, in the Internet of Things. It is quite suitable, including a four-fold increase in transmission distance and a 100% increase in speed. Bluetooth Mesh allows each node to accept and forward data. For the certification focus of Bluetooth, Chu Jiazheng said that it is divided into internal and external parts: internal certification focuses on the consistency of radio frequency, the consistency of radio frequency to physical layer, etc.; the external includes communication protocol interoperability test.
LoRa is a high-profile wide-area network that has attracted much attention in recent years. Its promotion organization LoRa Alliance hopes to extend this standard to the Internet of Things, M2M, smart city and manufacturing. LoRa features long-distance transmission and low power consumption due to The amount of data that can be transmitted is small, and it is suitable for data transmission. At present, LoRa only accepts the membership certification, and its product certification requires functional testing, but its RF implementation certification test is listed as one of the optional options.
In terms of medium distance, Wi-Fi is now the most mainstream technology in this field. Its certification only accepts members of the alliance, and only the alliance can grant certification marks. Currently, Wi-Fi certification content is based on IEEE. Various specifications, such as 802.11a, 802.11b, 802.11g, 802.11ac, 802.11n, etc. Currently, Dekai certification has provided a wide range of Wi-Fi testing and certification, including Wi-Fi Regulatory, InternaTIonal TypeApproval, Wi-Fi interoperability. TesTIng, WLAN Test Program Development, etc., the main customer base includes chip and module manufacturers, terminal equipment manufacturers, foundries and so on.
In addition to the above criteria, Chu Jiazheng said that other major communication standards, Dekai certification also provide services, he pointed out that the development of the Internet of Things has accelerated in recent years, in addition to the original technology of the IT industry, new standards have been continuously developed, At present, such as Bluetooth, Wi-Fi, etc. have become the mainstream standard for manufacturers to enter the market, and to be able to quickly obtain certification, in the testing phase can be assisted by professional certification agencies, it will be a multiplier.
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